[AZ-649] [AZ-674] [AZ-667] telemetry + vlm schema + mapobjects hydrate batch 6

AZ-649 mission_executor telemetry forwarding:
- shared::models::telemetry::UavTelemetry canonical model
- TelemetryForwarder with atomic ArcSwap snapshot + 3 lossy
  tokio::sync::broadcast channels (MissionExecutor, ScanController,
  MavlinkUplink) + per-consumer drop counters
- MavlinkProjection::from_mavlink for HEARTBEAT/GLOBAL_POSITION_INT/
  ATTITUDE/SYS_STATUS
- spawn_mavlink_pump bridges mavlink_layer into the forwarder at the
  binary edge

AZ-674 vlm_client schema validation + model_version tracking:
- AssessmentParser owns schema validation + model-version state
- wire::read_response_raw splits raw bytes from parsing so invalid
  payloads can be logged size-capped
- VlmStatus gains an Inconclusive variant; exhaustive-match test
  guards downstream consumers
- VlmPipelineStatus mirrors the new variant in shared::models::poi

AZ-667 mapobjects_store hydrate + pending logs + cascade:
- SyncState enum aligned with description.md (FreshBoot, Synced,
  CachedFallback, Degraded, Failed)
- Store::hydrate(MapObjectsBundle) replaces in-memory map atomically;
  freshness=Stale -> CachedFallback
- classify() + end_of_pass append MapObjectObservation events to
  pending_observations (New/Moved/Existing/RemovedCandidate)
- apply_decline + LocalAppended ignored items append to pending_ignored
- drain_pending() returns and clears both logs
- cascade_mission(id) purges by_cell + IgnoredSet + pending logs
- Health surface reports sync_state, pending_obs, pending_ign

Co-authored-by: Cursor <cursoragent@cursor.com>

crates/vlm_client/src/internal/mod.rs

@@ -1,5 +1,6 @@
 //! Internal modules used only by the feature-gated `vlm` build.
 
+pub mod parser;
 pub mod peer_cred;
 pub mod prompt;
 pub mod uds_client;

crates/vlm_client/src/internal/parser.rs

@@ -0,0 +1,239 @@
+//! NanoLLM response → `VlmAssessment` parsing + model-version tracking.
+//!
+//! AZ-674 introduces a separation between the wire layer (which
+//! returns raw bytes once the length prefix has been consumed) and
+//! the parsing layer (this module), which:
+//!
+//! 1. Validates the JSON against the `VlmAssessment` schema. Missing
+//!    required fields, wrong types, or anything else that fails
+//!    `serde_json::from_slice` returns
+//!    `VlmAssessment { status: SchemaInvalid, … }` — **NOT** an
+//!    `Err`. Schema-invalid is a recoverable outcome, observable by
+//!    `scan_controller`.
+//! 2. Logs the raw response (size-capped) at `warn` level whenever a
+//!    schema-invalid is returned. The cap is configurable; default
+//!    4 KiB per AZ-674 §Scope.
+//! 3. Tracks `model_version` across calls and emits a single
+//!    `info!` log line the first time a new version is observed.
+//!
+//! Required schema fields: `label`, `confidence`, `status`,
+//! `model_version`, `latency_ms`. `evidence_spans` and `reason` are
+//! optional (serde defaults to `Vec::new()` / `String::new()`).
+
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::sync::Mutex;
+
+use serde::Deserialize;
+use shared::models::vlm::{VlmAssessment, VlmLabel, VlmStatus};
+
+/// Default size cap for the raw-response log on schema-invalid.
+pub const DEFAULT_LOG_TRUNCATION_BYTES: usize = 4 * 1024;
+
+/// Parser + model-version tracker. Cloneable via `Arc` if a single
+/// instance must be shared across tasks; the inner state is internally
+/// synchronised.
+pub struct AssessmentParser {
+    last_model_version: Mutex<Option<String>>,
+    schema_invalid_count: AtomicU64,
+    model_version_changes: AtomicU64,
+    log_truncation_bytes: usize,
+}
+
+impl AssessmentParser {
+    pub fn new() -> Self {
+        Self::with_truncation_bytes(DEFAULT_LOG_TRUNCATION_BYTES)
+    }
+
+    pub fn with_truncation_bytes(bytes: usize) -> Self {
+        Self {
+            last_model_version: Mutex::new(None),
+            schema_invalid_count: AtomicU64::new(0),
+            model_version_changes: AtomicU64::new(0),
+            log_truncation_bytes: bytes,
+        }
+    }
+
+    /// Parse a raw response body into a `VlmAssessment`. A
+    /// schema-invalid response returns `VlmAssessment { status:
+    /// SchemaInvalid, … }`; never returns `Err`.
+    pub fn parse(&self, raw: &[u8]) -> VlmAssessment {
+        let assessment: VlmAssessment = match serde_json::from_slice::<VlmAssessmentWire>(raw) {
+            Ok(wire) => wire.into(),
+            Err(e) => {
+                self.schema_invalid_count.fetch_add(1, Ordering::Relaxed);
+                let excerpt = excerpt(raw, self.log_truncation_bytes);
+                tracing::warn!(
+                    error = %e,
+                    raw_excerpt = %excerpt,
+                    raw_bytes = raw.len(),
+                    "vlm_client schema-invalid response"
+                );
+                return schema_invalid(format!("json: {e}"));
+            }
+        };
+        self.track_model_version(&assessment.model_version);
+        assessment
+    }
+
+    /// Cumulative count of schema-invalid responses observed by this
+    /// parser instance. Used by the health surface.
+    pub fn schema_invalid_count(&self) -> u64 {
+        self.schema_invalid_count.load(Ordering::Relaxed)
+    }
+
+    /// Cumulative count of `model_version` change events emitted.
+    /// First successful parse counts as one change (None → "v1.0").
+    pub fn model_version_changes(&self) -> u64 {
+        self.model_version_changes.load(Ordering::Relaxed)
+    }
+
+    /// Latest seen `model_version` (`None` before the first
+    /// successful parse).
+    pub fn current_model_version(&self) -> Option<String> {
+        self.last_model_version
+            .lock()
+            .map(|g| g.clone())
+            .unwrap_or(None)
+    }
+
+    fn track_model_version(&self, current: &str) {
+        let mut guard = match self.last_model_version.lock() {
+            Ok(g) => g,
+            Err(_) => return,
+        };
+        let changed = !matches!(guard.as_deref(), Some(prev) if prev == current);
+        if changed {
+            let previous = guard.clone();
+            *guard = Some(current.to_string());
+            self.model_version_changes.fetch_add(1, Ordering::Relaxed);
+            tracing::info!(
+                previous = previous.as_deref().unwrap_or("<none>"),
+                current = current,
+                "vlm_client model_version changed"
+            );
+        }
+    }
+}
+
+impl Default for AssessmentParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Wire-side parse target. Matches the production NanoLLM envelope
+/// per `description.md §8`. Required fields are non-`Option`; serde
+/// will refuse to deserialise without them. Optional fields default
+/// to empty.
+#[derive(Debug, Deserialize)]
+struct VlmAssessmentWire {
+    label: VlmLabel,
+    confidence: f32,
+    #[serde(default)]
+    evidence_spans: Vec<String>,
+    #[serde(default)]
+    reason: String,
+    status: VlmStatus,
+    latency_ms: u32,
+    model_version: String,
+}
+
+impl From<VlmAssessmentWire> for VlmAssessment {
+    fn from(w: VlmAssessmentWire) -> Self {
+        Self {
+            label: w.label,
+            confidence: w.confidence,
+            evidence_spans: w.evidence_spans,
+            reason: w.reason,
+            status: w.status,
+            latency_ms: w.latency_ms,
+            model_version: w.model_version,
+        }
+    }
+}
+
+fn schema_invalid(reason: impl Into<String>) -> VlmAssessment {
+    VlmAssessment {
+        label: VlmLabel::Inconclusive,
+        confidence: 0.0,
+        evidence_spans: Vec::new(),
+        reason: reason.into(),
+        status: VlmStatus::SchemaInvalid,
+        latency_ms: 0,
+        model_version: String::new(),
+    }
+}
+
+fn excerpt(raw: &[u8], cap: usize) -> String {
+    let cap = cap.min(raw.len());
+    let slice = &raw[..cap];
+    let mut s = String::from_utf8_lossy(slice).into_owned();
+    if raw.len() > cap {
+        s.push_str(&format!("…[truncated, {} more bytes]", raw.len() - cap));
+    }
+    s
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn ok_response_bytes() -> Vec<u8> {
+        let s = r#"{
+            "label":"confirmed_concealed_position",
+            "confidence":0.85,
+            "evidence_spans":["foliage"],
+            "reason":"match",
+            "status":"ok",
+            "latency_ms":42,
+            "model_version":"VILA1.5-3B-int4"
+        }"#;
+        s.as_bytes().to_vec()
+    }
+
+    #[test]
+    fn parses_valid_payload() {
+        // Arrange
+        let parser = AssessmentParser::new();
+
+        // Act
+        let a = parser.parse(&ok_response_bytes());
+
+        // Assert
+        assert_eq!(a.status, VlmStatus::Ok);
+        assert_eq!(a.model_version, "VILA1.5-3B-int4");
+        assert_eq!(parser.schema_invalid_count(), 0);
+    }
+
+    #[test]
+    fn missing_required_field_returns_schema_invalid() {
+        // Arrange — drop `model_version` from the payload.
+        let raw = br#"{
+            "label":"confirmed_concealed_position",
+            "confidence":0.85,
+            "status":"ok",
+            "latency_ms":42
+        }"#;
+        let parser = AssessmentParser::new();
+
+        // Act
+        let a = parser.parse(raw);
+
+        // Assert
+        assert_eq!(a.status, VlmStatus::SchemaInvalid);
+        assert_eq!(parser.schema_invalid_count(), 1);
+    }
+
+    #[test]
+    fn excerpt_truncates_long_bodies() {
+        // Arrange
+        let raw = vec![b'a'; 8192];
+
+        // Act
+        let s = excerpt(&raw, 16);
+
+        // Assert
+        assert!(s.starts_with("aaaaaaaaaaaaaaaa"));
+        assert!(s.contains("truncated"));
+    }
+}

crates/vlm_client/src/internal/uds_client.rs

@@ -23,9 +23,10 @@ use tokio::net::UnixStream;
 use tokio::sync::Mutex;
 use tokio::time::timeout;
 
+use super::parser::AssessmentParser;
 use super::peer_cred::{check as check_peer, ExpectedPeer, PeerCredOutcome};
 use super::prompt::{self, Limits};
-use super::wire::{read_response, write_request, WireError};
+use super::wire::{read_response_raw, write_request, WireError};
 
 /// Errors returned from `connect`.
 #[derive(Debug, thiserror::Error)]
@@ -83,6 +84,7 @@ impl NanoLlmClientOptions {
 pub struct NanoLlmClient {
     inner: Arc<Mutex<Inner>>,
     options: Arc<NanoLlmClientOptions>,
+    parser: Arc<AssessmentParser>,
 }
 
 struct Inner {
@@ -118,6 +120,7 @@ impl NanoLlmClient {
         Ok(Self {
             inner: Arc::new(Mutex::new(inner)),
             options: Arc::new(options),
+            parser: Arc::new(AssessmentParser::new()),
         })
     }
 
@@ -125,6 +128,12 @@ impl NanoLlmClient {
         &self.options.socket_path
     }
 
+    /// Shared parser. Exposes schema-invalid + model-version counters
+    /// for the health surface.
+    pub fn parser(&self) -> Arc<AssessmentParser> {
+        self.parser.clone()
+    }
+
     /// Latency samples snapshot (cloned). Caller computes p50/p99.
     pub async fn latency_samples(&self) -> Vec<Duration> {
         self.inner.lock().await.latency_samples.clone()
@@ -179,7 +188,7 @@ impl NanoLlmClient {
             .expect("stream present after reconnect");
         match timeout(
             self.options.request_deadline,
-            send_and_recv(stream, &prompt, &roi),
+            send_and_recv(stream, &prompt, &roi, &self.parser),
         )
         .await
         {
@@ -270,10 +279,14 @@ async fn send_and_recv(
     stream: &mut UnixStream,
     prompt: &str,
     roi: &[u8],
+    parser: &AssessmentParser,
 ) -> Result<VlmAssessment, WireError> {
     write_request(stream, prompt, roi).await?;
-    let resp = read_response(stream).await?;
-    Ok(resp)
+    let body = read_response_raw(stream).await?;
+    // Schema validation lives in `AssessmentParser::parse`, not the
+    // wire layer. A JSON-broken or schema-invalid body returns
+    // `VlmAssessment{ status: SchemaInvalid }` — NOT an `Err`.
+    Ok(parser.parse(&body))
 }
 
 fn push_latency(samples: &mut Vec<Duration>, d: Duration) {

crates/vlm_client/src/internal/wire.rs

@@ -14,6 +14,7 @@
 
 use base64::Engine;
 use serde::{Deserialize, Serialize};
+#[cfg(test)]
 use shared::models::vlm::VlmAssessment;
 use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
 
@@ -64,7 +65,11 @@ pub async fn write_request<W: AsyncWrite + Unpin>(
     Ok(())
 }
 
-pub async fn read_response<R: AsyncRead + Unpin>(r: &mut R) -> Result<VlmAssessment, WireError> {
+/// Read one length-prefixed frame body. The body is returned as raw
+/// bytes; JSON parsing is the [`crate::internal::parser`]'s job
+/// (AZ-674 §AC-2 — schema-invalid responses must be observable as
+/// `VlmAssessment{ status: SchemaInvalid }`, not as `Err`).
+pub async fn read_response_raw<R: AsyncRead + Unpin>(r: &mut R) -> Result<Vec<u8>, WireError> {
     let mut lenbuf = [0u8; 4];
     r.read_exact(&mut lenbuf).await?;
     let len = u32::from_be_bytes(lenbuf);
@@ -76,6 +81,14 @@ pub async fn read_response<R: AsyncRead + Unpin>(r: &mut R) -> Result<VlmAssessm
     if n != body.len() {
         return Err(WireError::UnexpectedEof);
     }
+    Ok(body)
+}
+
+/// Legacy combined-read helper used by the in-tree wire-layer tests.
+/// Production code calls `read_response_raw` + `AssessmentParser::parse`.
+#[cfg(test)]
+pub async fn read_response<R: AsyncRead + Unpin>(r: &mut R) -> Result<VlmAssessment, WireError> {
+    let body = read_response_raw(r).await?;
     let assessment: VlmAssessment = serde_json::from_slice(&body)?;
     Ok(assessment)
 }

crates/vlm_client/src/lib.rs

@@ -21,6 +21,8 @@ mod internal;
 #[cfg(feature = "vlm")]
 pub use enabled::VlmClient;
 #[cfg(feature = "vlm")]
+pub use internal::parser::{AssessmentParser, DEFAULT_LOG_TRUNCATION_BYTES};
+#[cfg(feature = "vlm")]
 pub use internal::peer_cred::ExpectedPeer;
 #[cfg(feature = "vlm")]
 pub use internal::prompt::Limits;